The writing process for the majority of Metallicaâs albums have followed the same process. A large slew of guitar riffs written primarily by James Hetfield, sometimes Kirk Hammett, and rarely the bandâs bass player, (that now being bass virtuoso Robert Trujillo) are reviewed and selected.
1 Delhi is most polluted city in the world in PM2.5 concentrations. 2  Half of the top 20 most polluted cities were in India, according to data.  PM2.5 is considered most harmful to health.
In February, Baoding was given the unwanted title of having the worst air quality in the whole of China. March 2013: pollution fills the air in Baoding, Hebei province â now officially Chinaâs most polluted city. March 2013: pollution fills the air in Baoding, Hebei province â now officially Chinaâs most polluted city.